GREP(1-SysV)        RISC/os Reference Manual         GREP(1-SysV)



NAME
     grep - search a file for a pattern

SYNOPSIS
     grep [options] limited regular expression [file ...]

DESCRIPTION
     grep searches files for a pattern and prints all lines that
     contain that pattern.  grep uses limited regular expressions
     (expressions that have string values that use a subset of
     the possible alphanumeric and special characters) like those
     used with ed (1) to match the patterns.  It uses a compact
     non-deterministic algorithm.

     Be careful using the characters $, *, [, ^, |, (, ), and \
     in the limited regular expression because they are also
     meaningful to the shell.  It is safest to enclose the entire
     limited regular expression in single quotes '...'.

     If no files are specified, grep assumes standard input.
     Normally, each line found is copied to standard output.  The
     file name is printed before each line found if there is more
     than one input file.

     Command line options are:

     -b    Precede each line by the file block number on which it
           was found.  The first block is numbered 0.  The block
           size used to compute this block number is 512 bytes.
           This option can be useful in locating disk block
           numbers by context.
     -c    Print only a count of the lines that contain the pat-
           tern.
     -i    Ignore upper/lower case distinction during comparis-
           ons.
     -l    Print the names of files with matching lines once,
           separated by new-lines.  Does not repeat the names of
           files when the pattern is found more than once.
     -n    Precede each line by its line number in the file
           (first line is 1).
     -s    Suppress error messages about nonexistent or unread-
           able files
     -v    Print all lines except those that contain the pattern.

SEE ALSO
     ed(1), egrep(1), fgrep(1), sed(1), sh(1).

DIAGNOSTICS
     Exit status is 0 if any matches are found, 1 if none, 2 for
     syntax errors or inaccessible files (even if matches were
     found).




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GREP(1-SysV)        RISC/os Reference Manual         GREP(1-SysV)



ERRORS
     Lines are limited to BUFSIZ characters; longer lines are
     truncated.  BUFSIZ is defined in /usr/include/stdio.h.
     If there is a line with embedded nulls, grep will only match
     up to the first null; if it matches, it will print the
     entire line.

















































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